It's captioned as a B-24J, U.S. serial number 42-40380. However, the book "Special Ops Liberators" by Steve Bond and Richard Forder lists it as B-24J-160-CO, ex 42-40350 of the 861st BS/493 BG. To add to the confusion, it seems that U.S serial number is from a batch of B-24D-53-CO aicraft:

44-40380 was formerly 'Kentucky Kloudhopper' which "flew 3 combat missions with the 493rd BG before being transferred to the 803rd BS (Composite) and thence to the RAF 100 Group." See photo and details here:

Air Britain Liberator book lists TS532 as 44-40380 B-24J-160-CO or Liberator B.IV and confirms ex 861BS/493BG. Robertsons serials says it was from a batch of 21 built by Consolidated, some as C.IV and others like TS532 as BIV, but definitely built that way. This not quite right as was one of 21 transferred from USAAF.

Special Ops Liberators has several apparent gremlins and on page 228 lists it as 44-40350 just to add to the permutations.

As for the painted serial it is not uncommon to find confusion in this area in removing the year numbers and getting the result wrong.

On U.S.A.A.F. machines, it was standard practice not to paint the first digit of the fiscal year, only the second, and no hyphen. Hence 44-40380 would normally appear painted 440380 on the fins. But a painting error is always possible.